When did the Social Security Administration begin tracking the SSDI?

Question

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The Social Security Administration began tracking the SSDI in 1962, which stands for Social Security Death Index. It is a database of deceased individuals who had a Social Security number and whose death was reported to the Social Security Administration. The SSA updates this index regularly and makes it available to the public for genealogical and research purposes.

When Did the Social Security Administration Begin Tracking the SSDI